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  1. Arnieg

    ASME code exclusion requirements

    The bottom line is that all too often we are working hard installing relief valves on systems that can not be over-pressured, (physically impossible). These relief valves will never lift due to an over-pressure situation. Sizing a valve that will never lift is a farce. These useless valves...
  2. Arnieg

    ASME code exclusion requirements

    I personally feel that wasting money, time, etc., installing relief devices on equipment that is inherently safe, (no credible over-pressure scenario / no liability), is a shame and reflects poorly on the engineering profession. It leads to contempt and ridicule. Unfortunately, I suspect that...
  3. Arnieg

    ASME code exclusion requirements

    I do not believe CC 2211 can be used when the fluid is water. It might be OK on the oil side.
  4. Arnieg

    API Fire Sizing for PSV on S&T HEX Tubeside

    According to the engineering department at API Heat Trasnfer the tubes / tube sheets on the code stamped tube and shell heat exchangers that they manufacture are code. The U-1 form that they provide with the heat exchangers requires the owner to provide relief valve protection on both the shell...
  5. Arnieg

    ASME code exclusion requirements

    Are all of the components mounted on the skid of a package centrifugal air compressor excluded from the ASME code? Typically centrifugal air compressor manufacturers install a tube and shell oil cooler on the air compressor skids of packaged compressor units. Most manufacturers do not relief...
  6. Arnieg

    ASME code pressure exclusion requirements

    We have a 15,000 gallon liquid nitrogen storage tank that is operated at 14 psig. The tank is enclosed in a vacuum casing under a full vacuum, therefore the outer pressure on the liquid storage tank is 0 psia. Under these conditions the net pressure on the liquid storage tank is 28.7 psi, (14...
  7. Arnieg

    Motor 2X vibration problem

    I have three 1500 HP, 4160 volt, 60 Hz, 3600 RPM, horizontal Siemens induction motors that drive centrifugal air compressor. One of the three units has had a higher vibration level than the other two from the start. At initial start up the motor had a high 2X running vibration level. The...

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